I added a Keystone CL-40 (5-ohm, 6A) inrush current limiter to the
primary
of the power transformer in each 516F-2 power supply. The purpose
is to
reduce the shock and stress on the tubes when the KWM-2A or 32S-3
comes up
from a cold start. The CL-40 also reduces the inrush current as
the HV/LV

capacitors charge up to full voltage.
The CL-40 part is available from Mouser and others for around $2.
It should be added to any 516F-2 regardless of whether it uses tube

rectifiers or diodes, to extend the life of the tubes in the
transceiver or

transmitter.
73 Bill N4LG
At 07:54 AM 9/8/2016, Bill Cotter wrote:
>Joe,
>
>I have installed and used two of the W0IY conversion kits in my
>516F-2 power supplies for the KWM-2A and 32S-3. The design by the
>former Collins engineers is well thought out, and the quality is
>nothing short of what Collins would have expected. The kits also

>address the downside issues of solid-stating a 516F-2 that have
been

>presented by this group.
>

>Both of my conversions are setup to use the rectifier filament
windings

>as "bucking" in the transformer primary, and the HV/LV/filament

>voltages are right on specification with the AC line voltage at
115VAC.

>The best part is the power supplies runs absolutely cold.
>
>73 Bill N4LG
>